Natural gas prices have tumbled to a fresh 10-year low after word of a surprising jump in U.S. supplies.

There's enough gas in storage to supply all the country's needs for more than a month, and analysts say storage facilities across the U.S. will be pushed close to capacity in coming months.

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Meanwhile, the price of retail gasoline rose by a penny to a national average of $3.92 per gallon, according to AAA, Wright Express and Oil Price Information Service.

Gasoline remains at the highest price ever for this time of year, and analysts expect the national average to peak as high as $4.25 per gallon. Pump prices are already higher than $4 per gallon in 10 states and Washington D.C.